How to find this guy?

I just got a copy of Ocarina of Time a couple of days ago & I'm already up to the part of getting into the Dodongo's Cave right now. At the moment, I've been trying to sell some of the masks for the Happy Mask Sellsman & I just got the Bunny Hood. So I've been trying to find the Running Man in the Hyrule Field to sell the mask to him, but I can't find him. Where is he? I know he's near the Lon Lon Ranch & that's about it.